SDL source snapshots
The latest development version of SDL is available via Mercurial.
Mercurial allows you to get up-to-the-minute fixes and enhancements; as a developer works on a source tree, you can mirror it instead of waiting for an official release.
If you're new to Mercurial, check out the great tutorial at hginit.com!
SDL 2.0
The TODO list for the next release is available here.hg clone http://hg.libsdl.org/SDL
Source snapshot for SDL 2.0 (Updated Sat Jul 18 )
SDL-2.0.13-13958.zip
SDL-2.0.13-13958.tar.gz
Note: These are not official releases and may be unstable!